Stainless steel gate valve

Abstract

The utility model belongs to the technical field of valves and discloses a stainless steel gate valve. The stainless steel gate valve comprises a valve body, a valve cover and a valve rod, the valve cover is connected to the valve body, the valve rod is rotatably arranged in the valve cover in a penetrating mode, a boss is arranged on the circumferential side of the valve rod in a protruding mode, an inserting hole is formed in the valve cover, a protruding shoulder is arranged in the inserting hole in a protruding mode, the boss is arranged in the inserting hole, and the bottom face of the boss can abut against the protruding shoulder. The valve rod is sleeved with the pressing cap which is detachably connected to the top end of the valve deck. According to the stainless steel gate valve provided by the utility model, the valve rod can be independently taken out from the valve cover when necessary and is convenient to disassemble and assemble, and the valve rod is convenient to maintain, overhaul or replace.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field especially relates to a stainless steel gate valve. BACKGROUND

[0002] Gate valve is a kind of commonly used cut-off valve in pipeline system.The prior art disclosed in the patent application No.CN116733994A discloses a full clamping pressure type gate valve structure and manufacturing method, when manufacturing valve rod, convex shaft and double-channel O-shaped ring located above convex shaft are arranged in the middle of valve rod, then valve rod is assembled into valve rod hole from bottom to top through the mounting hole of valve cover, until the upper step surface of convex shaft contacts the upper inner shoulder of valve rod hole is limited, then the lower part of valve rod pipe is rolled by rolling process to make the outer diameter size of valve rod pipe reduce again, to form lower inner shoulder in valve rod hole, the lower inner shoulder contacts on the lower step surface of convex shaft, and the upper and lower inner shoulders form positioning groove for positioning rotating installation of the convex shaft of valve rod, to ensure that convex shaft can rotate freely in positioning groove but not fall off. But this setting mode is equivalent to that valve rod and valve cover are fixed as a whole, when maintaining or overhauling, valve rod cannot be disassembled alone, so it cannot be replaced or maintained.

[0003] Therefore, it is urgent to provide a stainless steel gate valve to solve the above problems. CONTENT OF THE UTILITY MODEL

[0004] The utility model discloses a stainless steel gate valve, valve rod can be taken out from valve cover alone when necessary, and it is convenient to disassemble.

[0005] To achieve this purpose, the utility model adopts the following technical scheme:

[0006] Stainless steel gate valve, including valve body, valve cover and valve rod, the valve cover is connected on the valve body, the valve rod is rotatably arranged in the valve cover, the convex platform is arranged on the circumferential side of the valve rod, the insertion hole is formed in the valve cover, the convex shoulder is arranged in the insertion hole, the convex platform is arranged in the insertion hole, and the bottom surface of the convex platform can abut on the convex shoulder, the stainless steel gate valve further includes the pressure cap, the pressure cap is sleeved on the valve rod and detachably connected to the top end of the valve cover.

[0007] As an optional scheme, the valve body includes a main body and pipe joints welded on both sides of the main body, the flow holes are formed in both sides of the main body, one end of the pipe joint extends into the main body through the flow hole, the end of the pipe joint extending into the main body is a welded part, the stainless steel gate valve further includes a gate plate, the gate plate is arranged in the valve body and is threadedly connected with the valve rod, and the welded part has a sealing surface abutting on the gate plate to form a seal.

[0008] As an optional solution, the sealing surface is an inclined surface, the inclined directions of the sealing surfaces of the two pipe joints are opposite, and the distance between the two sealing surfaces gradually decreases from top to bottom.

[0009] As an optional solution, the body, the pipe joint and the valve cover are all extrusion-formed.

[0010] As an optional solution, the pipe joint is provided with a threaded portion at the end away from the welding portion, and the inner periphery of the threaded portion is provided with internal threads.

[0011] As an optional solution, the pipe joint further comprises a wrenching portion, which is arranged between the welding portion and the threaded portion, and the outer diameter of the wrenching portion is greater than the outer diameters of the welding portion and the threaded portion.

[0012] As an optional solution, a step surface is formed at the connection between the wrenching portion and the welding portion, the step surface abuts against the outer side wall of the body, and the welding position of the pipe joint and the body is the position where the outer edge of the step surface contacts the side wall of the body.

[0013] As an optional solution, the compression cap is threadedly connected to the outside of the valve cover.

[0014] As an optional solution, a sealing ring is arranged between the boss and the insertion hole.

[0015] As an optional solution, the top end of the valve rod extends out of the valve cover and is connected with a hand wheel.

[0016] The utility model discloses beneficial effects:

[0017] The utility model provides a stainless steel gate valve, the valve rod can be installed from the upper end opening of the insertion hole of the valve cover by the upper to the down, until the boss lower end surface of valve rod abuts on the boss, then the compression cap is installed on the valve rod and is connected with the valve cover, and the boss and the compression cap can limit the up and down of the valve rod. When needing to disassemble the valve cover, first, the compression cap is taken off from the valve cover and the valve cover, and then the valve rod is taken out from the valve cover. Therefore, the stainless steel gate valve provided by the utility model, the valve rod can be taken out from the valve cover individually when necessary, and the dismounting is convenient, and the valve rod is convenient for maintenance, overhaul or replacement. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the structure schematic diagram of the stainless steel gate valve provided by the utility model;

[0019] Figure 2 It is the sectional view of the stainless steel gate valve provided by the utility model;

[0020] Figure 3 It is the cooperation structure schematic diagram of the valve body and the gate plate provided by the utility model.

[0021] Figure 4 is the morphological change chart in the main body forming process provided by the utility model;

[0022] Figure 5 is the morphological change chart in the pipe joint forming process provided by the utility model;

[0023] Figure 6 is the morphological change chart in the valve cover forming process provided by the utility model.

[0024] In the drawings:

[0025] 10, stainless steel plate; 20, stainless steel pipe;

[0026] 1, valve body; 11, main body; 111, water flow hole; 112, valve cavity; 113, connecting thread; 12, pipe joint; 121, welding part; 1211, sealing surface; 122, threaded part; 1221, internal thread; 123, pulling opening; 124, step surface;

[0027] 2, valve cover; 21, insertion hole; 22, shoulder; 23, opening; 24, first external thread; 25, second external thread;

[0028] 3, valve rod; 31, boss;

[0029] 4, pressing cap; 5, gate plate; 6, sealing ring; 7, hand wheel. DETAILED DESCRIPTION

[0030] The utility model will be further explained in detail below in combination with the drawings and examples. It can be understood that the specific examples described here are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0031] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0032] In the utility model, unless otherwise expressly provided and limited, the first feature is "on" or "under" the second feature, which can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0033] In the description of the present embodiment, the terms "upper", "lower", "right", "left", and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] As shown in Figures 1 to 6 The utility model provides a stainless steel gate valve, including valve body 1, valve cover 2 and valve stem 3, valve cover 2 is connected on valve body 1, valve stem 3 is rotatably arranged in valve cover 2, and the lateral side of valve stem 3 is provided with boss 31, the top of valve cover 2 is provided with insertion hole 21, the top of insertion hole 21 has opening 23 for the arrangement of valve stem 3, boss 31 is arranged in insertion hole 21, and the bottom surface of boss 31 can abut on shoulder 22, and the stainless steel gate valve further includes pressing cap 4, which is detachably connected to the top of valve cover 2.

[0035] The stainless steel gate valve provided by the embodiment can be installed from the upper end opening 23 of the insertion hole 21 of the valve cover 2 downwardly until the lower end surface of the boss 31 of the valve stem 3 abuts on the shoulder 22, and then the pressing cap 4 is sleeved on the valve stem 3 and connected with the valve cover 2. The shoulder 22 and the pressing cap 4 can limit the boss 31 in the insertion hole 21, so as to ensure that the boss 31 can rotate freely in the insertion hole 21, but cannot move up and down. When the valve cover 2 needs to be disassembled, the pressing cap 4 is first disassembled from the valve cover 2, and then the valve stem 3 is taken out from the valve cover 2 from bottom to top. Therefore, the stainless steel gate valve provided by the embodiment can be taken out from the valve cover 2 individually when necessary, and the disassembly and assembly are convenient, which is convenient for the maintenance, repair or replacement of the valve stem 3.

[0036] In the embodiment, the pressure cap 4 is threadedly connected to the valve cover 2. Specifically, the top end of the valve cover 2 is provided with a first external thread 24, and the inner side wall of the pressure cap 4 is provided with a thread structure threadedly matched with the first external thread 24, so that the pressure cap 4 is stably connected to the valve cover 2 and is convenient and fast to disassemble and assemble. In another alternative embodiment, the pressure cap 4 and the valve cover 2 can also be detachably connected through a steel wire retainer or a pin, which is not specifically limited here.

[0037] In the embodiment, as shown in Figure 2 , two sealing rings 6 are arranged between the boss 31 and the hole wall of the insertion hole 21 to prevent leakage of liquid. Specifically, two sealing grooves are formed in the outer circumferential side of the boss 31, and the sealing ring 6 is accommodated in the corresponding sealing groove. The hole wall of the insertion hole 31 is pressed against the sealing ring 6 to achieve a sealing effect. In other alternative embodiments, the sealing ring 6 can also be provided as one, three or more, which can be flexibly arranged according to actual needs, and is not specifically limited here.

[0038] Further, as shown in Figure 3 and Figure 4 , the valve body 1 comprises a main body 11 and two pipe joints 12 welded on both sides of the main body 11. The main body 11 is a cylindrical structure, and water flow holes 111 are formed in both sides of the main body 11. One end of the pipe joint 12 extends into the main body 11 through the water flow hole 111. The end of the pipe joint 12 extending into the main body 11 is a welded portion 121. The end of the pipe joint 12 extending out of the main body 11 is connected to an external pipeline. The stainless steel gate valve further comprises a gate plate 5. The main body 11 is provided with a valve cavity 112. The gate plate 5 is arranged in the valve cavity 112 and is threadedly connected with the valve rod 3. The welded portion 121 has a sealing surface 1211 abutting against the gate plate 5 to form a seal.

[0039] By rotating the valve rod 3, the gate plate 5 is raised or lowered in the valve cavity 112 along the threads of the valve rod 3, so as to cut off or connect the liquid flow passage, thereby achieving the closing or opening of the gate valve. When the gate valve is closed, the gate plate 5 is lowered to be completely located between the two pipe joints 12. At this time, the two side surfaces of the gate plate 5 respectively abut against the sealing surfaces 1211 on both sides to achieve a sealing effect, thereby effectively cutting off the fluid.

[0040] In the production of the valve body 1, the main body 11 and the two pipe joints 12 are first manufactured separately. Then, one end of each pipe joint 12 is inserted into the main body 11 through the water flow hole 111 on each side of the main body 11. Finally, the pipe joint 12 and the main body 11 are welded and fixed to form the valve body 1. The main body 11 and the pipe joint 12 are separately processed, which is convenient for processing and manufacturing.

[0041] In the embodiment, the sealing surface 1211 is a bevel, the directions of the bevels of the sealing surfaces 1211 of the two pipe joints 12 are opposite, and the distance between the two sealing surfaces 1211 gradually decreases from top to bottom, which is just matched with the shape of the gate plate 5. In this way, the taper seal between the gate plate 5 and the sealing surface 1211 is achieved, which is beneficial to improve the sealing reliability between the gate plate 5 and the sealing surface 1211.

[0042] As shown in Figure 1 and Figure 2 , the top end of the valve stem 3 extends out of the bonnet 2 and is connected with a hand wheel 7, which is convenient for the user to rotate the valve stem 3. By rotating the hand wheel 7 in different directions around the axis, the valve stem 3 can be driven to rotate synchronously. With the rotation of the valve stem 3, the gate plate 5 will rise or fall in the valve cavity 112 along the threads of the valve stem 3, so as to realize the closing or opening of the gate valve.

[0043] In the embodiment, the bonnet 2 is threadedly connected to the main body 11. Specifically, the bottom end of the bonnet 2 is provided with a second external thread 25, and the inner side wall of the top end of the main body 11 is provided with a connecting thread 113 threadedly matched with the second external thread 25, so as to realize the stable connection of the bonnet 2 and the main body 11, and the convenient and fast disassembly and assembly. In another alternative embodiment, the bonnet 2 and the main body 11 can also be detachably connected through a steel wire retainer or a pin, which is not limited here.

[0044] Further, as shown in Figure 3 , the pipe joint 12 is provided with a threaded portion 122 at the end away from the welding portion 121, and the inner periphery of the threaded portion 122 is provided with an internal thread 1221, which is convenient for connecting with the external pipeline. In other alternative embodiments, an external thread can also be machined on the outer periphery of the threaded portion 122 to realize the connection with the external pipeline.

[0045] Further, as shown in Figure 3 , the pipe joint 12 further comprises a wrench opening portion 123, which is arranged between the welding portion 121 and the threaded portion 122, and the outer diameter of the wrench opening portion 123 is greater than that of the welding portion 121 and the threaded portion 122. In the embodiment, the wrench opening portion 123 is hexagonal, which is convenient for cooperating with a wrench to assemble the pipe joint 12. In other alternative embodiments, the wrench opening portion 123 can also be provided in a regular polygonal structure such as pentagonal, heptagonal, etc., as long as it can cooperate with the wrench, which is not limited here.

[0046] It is worth noting that, in the embodiment, the threaded portion 122 and the wrench opening portion 123 are arranged staggered, compared with the traditional structure, the staggered arrangement at this position can ensure that the threaded portion 122 and the wrench opening portion 123 can each have a larger wall thickness, to ensure the structural strength of the two.

[0047] Further, the connection between the pull opening part 123 and the welding part 121 forms a step surface 124, which is a plane perpendicular to the axis of the pipe joint 12, the outer side wall of the main body 11 is also a plane perpendicular to the axis of the pipe joint 12, the step surface 124 abuts against the outer side wall of the main body 11, and the welding position of the pipe joint 12 and the main body 11 is the position where the outer edge of the step surface 124 abuts against the side wall of the main body 11. When assembling, the pipe joint 12 is inserted into the main body 11 through the water hole 111 until the step surface 124 abuts against the outer side wall of the main body 11, so that the positioning effect is achieved, and the depth of the pipe joint 12 inserted into the main body 11 is ensured to be consistent, and then welding is performed at the position where the outer edge of the step surface 124 abuts against the main body 11, so that the pipe joint 12 and the main body 11 are fixed together.

[0048] It can be understood that, due to factors such as convenient production, large output and low price, traditional household gate valves are basically copper valves, and the lead contained in the copper gate valve can affect water quality and cause harm to human health. Therefore, as the living standards continue to improve, more and more people begin to choose stainless steel gate valves. However, the existing stainless steel gate valves are mainly produced by casting, and the casting has the following disadvantages: 1) long cycle and high cost; 2) due to the serious pollution of casting to the environment, the state has strict control on stainless steel casting enterprises in policy guidance (such as the number of approvals for stainless steel casting enterprises and the production capacity of such enterprises), which leads to a relatively long production cycle of stainless steel gate valves and an actual output that cannot meet market demand; 3) casting production is harmful to the human body, so the labor cost of the workers responsible for casting work is also relatively high, which leads to a relatively high cost of enterprises producing stainless steel gate valves.

[0049] In order to solve the above problems, in the present embodiment, the main body 11, the pipe joint 12 and the valve cover 2 are all extrusion molded parts, that is, the main body 11, the pipe joint 12 and the valve cover 2 are all formed by extrusion process using stainless steel material, so that they are not strictly controlled in quantity due to environmental pollution caused by casting, and are suitable for mass production, and the production cycle of stainless steel gate valves in mass production is shortened and the production efficiency is improved.

[0050] Specifically, in combination with Figure 4 The main body 11 is formed into its final shape by at least twice extrusion stretching of a stainless steel plate 10, forms a valve cavity 112, then the water hole 111 is machined on both sides of the main body 11, and finally the connecting thread 113 is machined on the inner side wall of the top end of the main body 11.

[0051] In combination with Figure 5The pipe joint 12 is formed by extruding and stretching a stainless steel pipe 20 at least twice to obtain its final shape, and then tapping an internal thread 1221 on the inner side wall of the welding portion 121 of the pipe joint 12, and turning the outer surface of the welding portion 121.

[0052] In combination Figure 6 The valve cover 2 is also formed by extruding and stretching a stainless steel pipe 20 at least twice to obtain its final shape, and then tapping a first external thread 24 and a second external thread 25 on the outer side walls of the upper and lower ends of the valve cover 2, respectively, to obtain the shoulder 22 inside the insertion hole 21.

[0053] In the production of the stainless steel valve body 1, the main body 11, the pipe joint 12 and the valve cover 2 are manufactured separately through extrusion process, and then the welding portions 121 of the two pipe joints 12 are inserted into the main body 11 through the water flow holes 111 on the two sides of the main body 11, respectively, and then the two pipe joints 12 are welded and fixed to the main body 11 to form the valve body 1. In order to ensure the consistency of the sealing surfaces 1211 of the two pipe joints 12, the two sealing surfaces 1211 are machined by using the existing machining machine after the two pipe joints 12 are welded and fixed to the main body 11, so that they directly abut against the gate plate 5 to form a hard seal, thereby improving the sealing performance of the product. Then, the valve cover 2, the valve stem 3, the compression cap 4 and the hand wheel 7 are installed in sequence.

[0054] Obviously, the above embodiments of the present application are merely exemplary and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the scope of the present application. It is not necessary or possible to exhaust all the embodiments. Any modification, equivalent substitution and improvement within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A stainless steel gate valve comprising a valve body (1), a valve cover (2) connected to the valve body (1), and a valve stem (3) rotatably penetrating the valve cover (2), characterized in that, ​ 2. The stainless steel gate valve according to claim 1, wherein, The valve body (1) comprises a main body (11) and pipe joints (12) welded on both sides of the main body (11), both sides of the main body (11) are provided with water flow holes (111), one end of the pipe joint (12) extends into the main body (11) through the water flow hole (111), the end of the pipe joint (12) extending into the main body (11) is a welding portion (121), the stainless steel gate valve further comprises a gate plate (5), the gate plate (5) is arranged in the valve body (1) and is threadedly connected with the valve stem (3), and the welding portion (121) has a sealing surface (1211) abutting against the gate plate (5) to form a seal.

3. The stainless steel gate valve according to claim 2, wherein, The sealing surface (1211) is an inclined surface, the inclined directions of the sealing surfaces (1211) of the two pipe joints (12) are opposite, and the distance between the two sealing surfaces (1211) gradually decreases from top to bottom.

4. The stainless steel gate valve according to claim 3, wherein, The main body (11), the pipe joint (12) and the valve cover (2) are all extrusion molded parts.

5. The stainless steel gate valve according to claim 3, wherein, The end of the pipe joint (12) away from the welding portion (121) is a threaded portion (122), and the inner periphery of the threaded portion (122) is provided with an internal thread (1221).

6. The stainless steel gate valve according to claim 5, wherein, The pipe joint (12) further comprises a pulling opening portion (123), the pulling opening portion (123) is arranged between the welding portion (121) and the threaded portion (122), and the outer diameter of the pulling opening portion (123) is greater than the outer diameters of the welding portion (121) and the threaded portion (122).

7. The stainless steel gate valve according to claim 6, wherein, The connecting position of the pulling opening portion (123) and the welding portion (121) forms a step surface (124), the step surface (124) abuts against the outer side wall of the main body (11), and the welding position of the pipe joint (12) and the main body (11) is the position where the outer edge of the step surface (124) contacts the side wall of the main body (11).

8. The stainless steel gate valve according to any one of claims 1 to 7, characterized in that The pressing cap (4) is threadedly connected to the outer side of the valve cover (2).

9. A stainless steel gate valve according to any one of claims 1-7, characterized in that A sealing ring (6) is arranged between the boss (31) and the hole wall of the insertion hole (21).

10. A stainless steel gate valve according to any one of claims 1-7, characterized in that The top end of the valve stem (3) extends out of the valve cover (2) and is connected with a hand wheel (7).

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